Effects of constraint between filaments on the radial compression properties of poly (l-lactic acid) self-expandable braided stents

Gutian Zhao; Muqing Liu; Dongwen Deng; Yuan Tian; Jie Cheng; Gensheng Wu; Yi Zhang; Zhonghua Ni

Polymer Testing (Jan 2021)

Effects of constraint between filaments on the radial compression properties of poly (l-lactic acid) self-expandable braided stents

Gutian Zhao,
Muqing Liu,
Dongwen Deng,
Yuan Tian,
Jie Cheng,
Gensheng Wu,
Yi Zhang,
Zhonghua Ni

Affiliations

Gutian Zhao: School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, 211189, China
Muqing Liu: School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, 211189, China
Dongwen Deng: School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, 211189, China
Yuan Tian: School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, 211189, China
Jie Cheng: School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, 211189, China
Gensheng Wu: School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing, 210037, China
Yi Zhang: Center of Interventional Radiology & Vascular Surgery, Department of Radiology, Zhongda Hospital, Medical School, Southeast University, Nanjing, 210044, China
Zhonghua Ni: School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, 211189, China; Corresponding author. 79 Suyuan Avenue, School of Mechanical Engineering, Southeast University, Nanjing, 211189, China.

Journal volume & issue: Vol. 93
p. 106963

Abstract

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With the application of bioresorbable materials in self-expandable braided stent, current analytical model for radial compression property of the stent is not applicative if considering the constraint between the polymeric filaments. Poly (l-lactic acid) (PLLA) is one of the broadly used bioresorbable materials in stents due to its superior biocompatibility and mechanical properties. The radial compression properties of PLLA braided stents were investigated by considering two types of constraints between filaments in this work. Weak constraint indicates the friction between filaments of PLLA stents and strong constraint indicates the close looped end (extremity configuration) of PLLA stents. It is found that the radial stiffness can be enhanced by two types of constraints, and strong constraint improves the peak compression force slightly in the radial compression behavior of PLLA braided stents. This work provides suggestions for the study of PLLA braided stents theoretical development.

Published in Polymer Testing

ISSN: 0142-9418 (Print); 1873-2348 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Chemical technology: Polymers and polymer manufacture
Website: https://www.journals.elsevier.com/polymer-testing

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